477 lines
13 KiB
C++
477 lines
13 KiB
C++
#include <cubescript/cubescript.hh>
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#include "cs_util.hh"
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#include "cs_vm.hh"
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#include "cs_strman.hh"
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#include <cctype>
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#include <cmath>
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#include <iterator>
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#include <algorithm>
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namespace cscript {
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static inline char const *p_skip_white(char const *beg, char const *end) {
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while ((beg != end) && isspace(*beg)) {
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++beg;
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}
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return beg;
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}
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static inline void p_set_end(
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char const *nbeg, char const *nend, std::string_view *end
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) {
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if (!end) {
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return;
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}
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*end = std::string_view{nbeg, std::size_t(nend - nbeg)};
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}
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/* this function assumes the input is definitely a hex digit */
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static inline cs_int p_hexd_to_int(char c) {
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if (c >= 97) { /* a-f */
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return (c - 'a') + 10;
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} else if (c >= 65) { /* A-F */
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return (c - 'A') + 10;
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}
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/* 0-9 */
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return c - '0';
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}
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static inline bool p_check_neg(char const *&input) {
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bool neg = (*input == '-');
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if (neg || (*input == '+')) {
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++input;
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}
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return neg;
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}
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cs_int cs_parse_int(std::string_view input, std::string_view *endstr) {
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char const *beg = input.begin();
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char const *end = input.end();
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char const *orig = beg;
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beg = p_skip_white(beg, end);
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if (beg == end) {
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p_set_end(orig, end, endstr);
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return cs_int(0);
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}
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bool neg = p_check_neg(beg);
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cs_int ret = 0;
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char const *past = beg;
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if ((end - beg) >= 2) {
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std::string_view pfx = std::string_view{beg, 2};
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if ((pfx == "0x") || (pfx == "0X")) {
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beg += 2;
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past = beg;
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while ((past != end) && isxdigit(*past)) {
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ret = ret * 16 + p_hexd_to_int(*past++);
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}
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goto done;
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} else if ((pfx == "0b") || (pfx == "0B")) {
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beg += 2;
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past = beg;
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while ((past != end) && ((*past == '0') || (*past == '1'))) {
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ret = ret * 2 + (*past++ - '0');
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}
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goto done;
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}
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}
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while ((past != end) && isdigit(*past)) {
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ret = ret * 10 + (*past++ - '0');
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}
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done:
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p_set_end((past == beg) ? orig : past, end, endstr);
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if (neg) {
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return -ret;
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}
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return ret;
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}
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template<bool Hex, char e1 = Hex ? 'p' : 'e', char e2 = Hex ? 'P' : 'E'>
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static inline bool p_read_exp(char const *&beg, char const *end, cs_int &fn) {
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if (beg == end) {
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return true;
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}
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if ((*beg != e1) && (*beg != e2)) {
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return true;
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}
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if (++beg == end) {
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return false;
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}
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bool neg = p_check_neg(beg);
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if ((beg == end) || !isdigit(*beg)) {
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return false;
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}
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cs_int exp = 0;
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while ((beg != end) && isdigit(*beg)) {
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exp = exp * 10 + (*beg++ - '0');
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}
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if (neg) {
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exp = -exp;
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}
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fn += exp;
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return true;
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}
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template<bool Hex>
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static inline bool parse_gen_float(
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char const *&beg, char const *end, std::string_view *endstr, cs_float &ret
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) {
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auto read_digits = [&beg, end](double r, cs_int &n) {
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while ((beg != end) && (Hex ? isxdigit(*beg) : isdigit(*beg))) {
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if (Hex) {
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r = r * 16.0 + double(p_hexd_to_int(*beg));
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} else {
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r = r * 10.0 + double(*beg - '0');
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}
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++n;
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++beg;
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}
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return r;
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};
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cs_int wn = 0, fn = 0;
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double r = read_digits(0.0, wn);
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if ((beg != end) && (*beg == '.')) {
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++beg;
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r = read_digits(r, fn);
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}
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if (!wn && !fn) {
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return false;
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}
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fn = -fn;
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p_set_end(beg, end, endstr); /* we have a valid number until here */
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if (p_read_exp<Hex>(beg, end, fn)) {
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p_set_end(beg, end, endstr);
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}
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if (Hex) {
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ret = cs_float(ldexp(r, fn * 4));
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} else {
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ret = cs_float(r * pow(10, fn));
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}
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return true;
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}
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cs_float cs_parse_float(std::string_view input, std::string_view *endstr) {
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char const *beg = input.begin();
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char const *end = input.end();
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char const *orig = beg;
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beg = p_skip_white(beg, end);
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if (beg == end) {
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p_set_end(orig, end, endstr);
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return cs_float(0);
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}
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bool neg = p_check_neg(beg);
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cs_float ret = cs_float(0);
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if ((end - beg) >= 2) {
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std::string_view pfx = std::string_view{beg, 2};
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if ((pfx == "0x") || (pfx == "0X")) {
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beg += 2;
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if (!parse_gen_float<true>(beg, end, endstr, ret)) {
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p_set_end(orig, end, endstr);
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return ret;
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}
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goto done;
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}
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}
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if (!parse_gen_float<false>(beg, end, endstr, ret)) {
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p_set_end(orig, end, endstr);
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return ret;
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}
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done:
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if (neg) {
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return -ret;
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}
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return ret;
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}
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/* strref */
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cs_strref::cs_strref(cs_shared_state *cs, std::string_view str):
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p_state{cs}
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{
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p_str = cs->strman->add(str);
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}
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cs_strref::cs_strref(cs_state &cs, std::string_view str):
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p_state{cs.p_state}
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{
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p_str = p_state->strman->add(str);
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}
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cs_strref::cs_strref(cs_strref const &ref): p_state{ref.p_state}, p_str{ref.p_str}
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{
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p_state->strman->ref(p_str);
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}
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/* this can be used by friends to do quick cs_strref creation */
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cs_strref::cs_strref(char const *p, cs_shared_state *cs):
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p_state{cs}
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{
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p_str = p_state->strman->ref(p);
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}
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cs_strref::~cs_strref() {
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p_state->strman->unref(p_str);
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}
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cs_strref &cs_strref::operator=(cs_strref const &ref) {
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p_str = ref.p_str;
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p_state = ref.p_state;
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p_state->strman->ref(p_str);
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return *this;
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}
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cs_strref::operator std::string_view() const {
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return p_state->strman->get(p_str);
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}
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bool cs_strref::operator==(cs_strref const &s) const {
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return p_str == s.p_str;
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}
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namespace util {
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LIBCUBESCRIPT_EXPORT char const *parse_string(
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cs_state &cs, std::string_view str, size_t &nlines
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) {
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size_t nl = 0;
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nlines = nl;
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if (str.empty() || (str.front() != '\"')) {
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return str.data();
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}
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char const *beg = str.begin();
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char const *end = str.end();
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char const *orig = beg++;
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++nl;
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while (beg != end) {
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switch (*beg) {
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case '\r':
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case '\n':
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case '\"':
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goto end;
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case '^':
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case '\\': {
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bool needn = (*beg == '\\');
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if (++beg == end) {
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goto end;
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}
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if ((*beg == '\r') || (*beg == '\n')) {
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char c = *beg++;
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++nl;
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if ((beg != end) && (c == '\r') && (*beg == '\n')) {
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++beg;
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}
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} else if (needn) {
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goto end;
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} else {
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++beg;
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}
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continue;
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}
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default:
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break;
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}
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++beg;
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}
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end:
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nlines = nl;
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if ((beg == end) || (*beg != '\"')) {
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throw cs_error(
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cs, "unfinished string '%s'",
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std::string_view{orig, std::size_t(beg - orig)}
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);
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}
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return ++beg;
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}
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LIBCUBESCRIPT_EXPORT char const *parse_word(cs_state &cs, std::string_view str) {
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char const *it = str.begin();
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char const *end = str.end();
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for (; it != end; ++it) {
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std::string_view chrs{"\"/;()[] \t\r\n"};
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it = std::find_first_of(it, end, chrs.begin(), chrs.end());
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if (it == end) {
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return it;
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}
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switch (*it) {
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case '"':
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case ';':
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case ' ':
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case '\t':
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case '\r':
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case '\n':
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return it;
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case '/':
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if (((end - it) > 1) && (it[1] == '/')) {
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return it;
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}
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break;
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case '[':
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++it;
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it = parse_word(cs, std::string_view{
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it, std::size_t(end - it)
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});
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if ((it == end) || (*it != ']')) {
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throw cs_error(cs, "missing \"]\"");
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}
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break;
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case '(':
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++it;
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it = parse_word(cs, std::string_view{
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it, std::size_t(end - it)
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});
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if ((it == end) || (*it != ')')) {
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throw cs_error(cs, "missing \")\"");
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}
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break;
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case ']':
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case ')':
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return it;
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}
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}
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return it;
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}
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} /* namespace util */
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LIBCUBESCRIPT_EXPORT bool cs_list_parser::parse() {
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skip_until_item();
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if (p_input_beg == p_input_end) {
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return false;
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}
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switch (*p_input_beg) {
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case '"': {
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char const *qi = p_input_beg;
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p_input_beg = util::parse_string(*p_state, get_input());
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p_quoted_item = std::string_view{qi, p_input_beg};
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p_item = p_quoted_item.substr(1, p_quoted_item.size() - 2);
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break;
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}
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case '(':
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case '[': {
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char btype = *p_input_beg;
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int brak = 1;
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char const *ibeg = p_input_beg++;
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for (;;) {
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std::string_view chrs{"\"/;()[]"};
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p_input_beg = std::find_first_of(
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p_input_beg, p_input_end, chrs.begin(), chrs.end()
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);
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if (p_input_beg == p_input_end) {
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return true;
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}
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char c = *p_input_beg++;
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switch (c) {
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case '"':
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/* the quote is needed in str parsing */
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--p_input_beg;
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p_input_beg = util::parse_string(*p_state, get_input());
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break;
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case '/':
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if (
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(p_input_beg != p_input_end) &&
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(*p_input_beg == '/')
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) {
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p_input_beg = std::find(
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p_input_beg, p_input_end, '\n'
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);
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}
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break;
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case '(':
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case '[':
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brak += (c == btype);
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break;
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case ')':
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if ((btype == '(') && (--brak <= 0)) {
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goto endblock;
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}
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break;
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case ']':
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if ((btype == '[') && (--brak <= 0)) {
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goto endblock;
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}
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break;
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}
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}
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endblock:
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p_item = std::string_view{ibeg + 1, p_input_beg - 1};
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p_quoted_item = std::string_view{ibeg, p_input_beg};
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break;
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}
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case ')':
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case ']':
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return false;
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default: {
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char const *e = util::parse_word(*p_state, get_input());
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p_quoted_item = p_item = std::string_view{p_input_beg, e};
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p_input_beg = e;
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break;
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}
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}
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skip_until_item();
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if ((p_input_beg != p_input_end) && (*p_input_beg == ';')) {
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++p_input_beg;
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}
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return true;
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}
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LIBCUBESCRIPT_EXPORT std::size_t cs_list_parser::count() {
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size_t ret = 0;
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while (parse()) {
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++ret;
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}
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return ret;
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}
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LIBCUBESCRIPT_EXPORT cs_strref cs_list_parser::get_item() const {
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if (!p_quoted_item.empty() && (p_quoted_item.front() == '"')) {
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cs_charbuf buf{*p_state};
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util::unescape_string(std::back_inserter(buf), p_item);
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return cs_strref{*p_state, buf.str()};
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}
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return cs_strref{*p_state, p_item};
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}
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LIBCUBESCRIPT_EXPORT void cs_list_parser::skip_until_item() {
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for (;;) {
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while (p_input_beg != p_input_end) {
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char c = *p_input_beg;
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if ((c == ' ') || (c == '\t') || (c == '\r') || (c == '\n')) {
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++p_input_beg;
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} else {
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break;
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}
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}
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if ((p_input_end - p_input_beg) < 2) {
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break;
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}
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if ((p_input_beg[0] != '/') || (p_input_beg[1]) != '/') {
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break;
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}
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p_input_beg = std::find(p_input_beg, p_input_end, '\n');
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}
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}
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LIBCUBESCRIPT_EXPORT cs_strref value_list_concat(
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cs_state &cs, std::span<cs_value> vals, std::string_view sep
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) {
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cs_charbuf buf{cs};
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for (std::size_t i = 0; i < vals.size(); ++i) {
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switch (vals[i].get_type()) {
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case cs_value_type::INT:
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case cs_value_type::FLOAT:
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case cs_value_type::STRING:
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std::ranges::copy(
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cs_value{vals[i]}.force_str(), std::back_inserter(buf)
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);
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break;
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default:
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break;
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}
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if (i == (vals.size() - 1)) {
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break;
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}
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std::ranges::copy(sep, std::back_inserter(buf));
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}
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return cs_strref{cs, buf.str()};
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}
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} /* namespace cscript */
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